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H. 0. PHILLIPS.

INSULATING ELECT-RIG CONDUGTORS.

No. 286,220. Patented Oct. 9, 1883.

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ATTORNEY UNITED STATES PATENT OFFIC HERBERT O. PHILLIPS, OF \VATERBURY, CONNECTICUT, ASSIGNOB TO HOLMES, BOOTH & HAYDENS, OF SAME PLACE.

INSULATING ELECTFHC CONDUCTORS.

SPECIFICATION forming part of Letters Patent No. 286,220, dated October 9, 1883.

Application filed August 31,1883.

To all whom it may cmwern:

Be it known that I, HERBERT O. PHILLIrs, of \Vaterbury, in the county of New Haven and State of Connecticut, have invented a new and useful Improvement in Insulating Electric Conductors, of which the following is a specification.

The object of my invention is the better insulation of electric conductors from the infinence of heat and moisture, and the manner in which I effect this object is as follows:

I take a suitable electric conductor-such as a wireof copper or other suitable metaland give the naked wire a thorough and continuous coating of fire-proof material, such as asbestus or other suitably prepared palpt. Upon this coating I place a continuous covering' of cotton or other suitable fibrous material, either by winding or braiding it thereon in the usual manner in which wire is covered, and preferably while the coating on the naked wire is in such moist condition as to cause it to saturate the fibrous covering. This fibrous covering is now treated to a similar coat of fire proof material, and afterward to a coat of water-proof material-such as asphaltum or other bituminous substancethe brittleness of which has been first removed by an admixture of a non-volatile or non-drying liquid materialsuch as petroleum-tar, paraffiue-oil, or other analogous materialand is covered in the same manner with another jacketing of fibrous material braided on over the waterproof material, which is in turn treated with a coating of the fire-proof material before described, and the article thus formed is now passed through a compressingmachine and treated with silicic acid or other analogous material, as described and claimed in a companion application.

By covering the naked wire with the fireproof material first and braiding the fibrous jacket over the same, as herein described, the jacket is caused to thoroughly adhere to the wire and not to slip thereon, and at the same time securely bind the fire-proof material to (X0 model.)

the wire, and the placing of the coating of water-proof material between the two fibrous jackets treated with fire-proof material protects the same from injury by reason of heat and handling, and renders it much more durable than it would be were the asbestus waterproof material exposed as an outside covering.

In carrying out my invention the process herein described maybe repeated two or more times, and the coating of fire-proof material as applied first to the naked wire may be omitted and applied instead to the first covering of fibrous material without avoiding my invention,which in this instance consists in so applying to the conducting-wire its insulating-covering that the water-proof insulating material will occupy a position between two fibrous coverings treated with fire-proof material to protect it from the effects of heat and handling.

In the accompanying draw in gs, making part of this specification, Figure 1 represents a 1011- gitudinal view of the insulated conductor, showing the different steps in its manufacture; and Fig. 2 is a cross-section of the same.

A is the naked wire or electric conductor b, the first coating of fire-proof material; 0, the first covering of fibrous material; (1, the intervening coating of 'ater-proof material; 6, the second covering of fibrous material, and f the outer coating of fire-proof material.

\VhatI claim herein as my invention, and desire to secure by Letters Patent, is-

A metallic electric conductor consisting of a conducting-wire having two or more coverings of fibrous material treated? with fire-proof material, and having a water-proofmaterial such as the bituminous preparation hereinbefore described-intervening between them, substantially as herein set forth.

HERBERT O. PHILLIPS.

\Vitnesses:

GEO. H. BENHAM, H. H. WALKER. 

